fix forwarded proto

Author: azahnen

xtraplatform-base/src/main/java/de/ii/xtraplatform/base/domain/WebContext.java

@@ -21,4 +21,8 @@ default List<String> getPathPrefix() {
         ? List.of()
         : Splitter.on('/').trimResults().omitEmptyStrings().splitToList(getUri().getPath());
   }
+
+  default boolean isHttps() {
+    return "https".equalsIgnoreCase(getUri().getScheme());
+  }
 }

xtraplatform-web/src/main/java/de/ii/xtraplatform/web/domain/ForwardedUri.java

@@ -15,20 +15,33 @@
 public interface ForwardedUri {
 
   String X_FORWARDED_PREFIX = "X-Forwarded-Prefix";
+  String X_FORWARDED_PROTO = "X-Forwarded-Proto";
   Splitter PATH_SPLITTER = Splitter.on('/').trimResults().omitEmptyStrings();
 
   static URICustomizer from(ContainerRequestContext requestContext, WebContext webContext) {
-    return new URICustomizer(requestContext.getUriInfo().getRequestUri())
+    return customizer(requestContext, webContext)
         .prependPathSegments(prefix(requestContext, webContext));
   }
 
   static URICustomizer base(ContainerRequestContext requestContext, WebContext webContext) {
-    return new URICustomizer(requestContext.getUriInfo().getRequestUri())
+    return customizer(requestContext, webContext)
         .setPathSegments(prefix(requestContext, webContext))
         .ensureNoTrailingSlash()
         .clearParameters();
   }
 
+  static URICustomizer customizer(ContainerRequestContext requestContext, WebContext webContext) {
+    URICustomizer uriCustomizer = new URICustomizer(requestContext.getUriInfo().getRequestUri());
+
+    if (!"https".equalsIgnoreCase(uriCustomizer.getScheme())
+        && !requestContext.getHeaders().containsKey(X_FORWARDED_PROTO)
+        && webContext.isHttps()) {
+      uriCustomizer.setScheme("https");
+    }
+
+    return uriCustomizer;
+  }
+
   static List<String> prefix(ContainerRequestContext requestContext, WebContext webContext) {
     if (requestContext.getHeaders().containsKey(X_FORWARDED_PREFIX)) {
       return PATH_SPLITTER.splitToList(requestContext.getHeaderString(X_FORWARDED_PREFIX));